When science, art, literature, and philosophy are simply the manifestation of personality they are on a level where glorious and dazzling achievements are possible, which can make a man's name live for thousands of years.

Technological progress is like an axe in the hands of a pathological criminal.

Venus has a runaway greenhouse effect. I kind of want to know what happened there because we're twirling knobs here on Earth without knowing the consequences of it. Mars once had running water. It's bone dry today. Something bad happened there as well.

Good fame is like fire; when you have kindled you may easily preserve it; but if you extinguish it, you will not easily kindle it again.

By 2035, there will be almost no poor countries left in the world. Almost all countries will be what we now call lower-middle income or richer.